Trolley-pole



C. H. GUNN.

TROLLEY POLE.

APPLICATION min imma. 1919.

1,3?1955?, famed Man-15,1921.

@MME 62am/ ATTORNEY .UNITED STATES PATENT OFF-ICE.

TROLLEY-POLE.

Specicationof Letters Patent.

Patented Mar. 15, 1921.

Application filed March 29, 1919. Serial No. 286,028.

To all whom it may conce/m.'

Be it known that I, CHARLES II. GUNN, a citizen of the United States of America, residing at Emeryville, in the county of Alameda, State of California, have invented certain new and useful Improvements in Trolley-Poles; and I do declare the following to be a clear, full, and exact description of the saine, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this application.

This invention relates to improvements in trolley poles of the type used to conduct the electric current from the overhead wires to the motors of electric street and interurban cars.

The principal object of the invention is to provide a means for preventing the trolley wheel from so easily jumping off thewire for any reason, such as splices, crossings, rigid stretches of the wire which set up great vibration in the pole, and the like.

With the present form of pole having the stiftl spring at the base, this jumping off of the Wheel is of common occurrence, owing to the fact that the present heavy spring does not respond to the various shocks quickly enough and is too far away to readily absorb the ar and vibration in such instances as previously mentioned.

These objectionable features I have eliminated by interposing a flexible spring portion in the pole near the wheel.

As a further object, I have provided a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for which it is designed.

These objects, I accomplish by means of such structure and relative arrangement of the parts as will fully appear by a perusal of the following specification and claims.

On the drawings, similar characters of reference indicate corresponding parts in the several views.

Figure 1 is a side elevation of a trolley pole showing my improved features thereon.

Fig. 2 is an enlarged longitudinal section through the flexible portion of the pole.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 designates the lower portion of the pole having the usualstiif spring 2 at the base thereof attached to the roof of a car 3 for the usual purpose.

At a predetermined distance from the trolley wheel 4, the portion l of the pole terminates and has a collar 5 slidable thereon and positioned a certain distance below such termination. This collar may be adjusted on the pole 1 as for instance by a turnable nut 6 having a flange 7 beaded over a flange 8 on the collar 5, the nut being threaded on the pole 1. The collar has a pin 9 therethrough slidable in a slot 10 provided in the pole 1, which is hollow. A closely wound helical spring 11 seats on a flange 1a on the pole 1 above the collar 5, and extends upward to impinge at its upper end against a collar 12 lixed rigidly at the upper end of a short length of hollow pole 18 extending a certain distance down toward the top of the pole 1. The fork 14;

y of the wheel 4 is secured to the collar 12 at its upper end in any suitable manner.

A pin 15 passes through the collar 12 and the pole 13, to hold one end of a chain 16 whose lower end is secured to the pin 9 in the slidable sleeve 5.

By means of the adjustment feature of the collar, the distance between the sections may be altered to render the spring 11 more or less flexible as may be necessary.

A rubber hose 17 is placed about the spring 11 and extends from the collar 5 to the collar 12.

This form of construction permits of sufficient stiffness of the pole for all purposes and yet provides an efficient means for readily absorbing all shocks and jars due to unevenness of the trolley wire surface or other causes.

From the foregoing description, it will readily be seen that I have produced such a device as substantially fulfils the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice, such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described by invention, what I claim as new and useful and desire to secure by Letters Patent is 1. A trolley pole including an upper and a lower section spaced apart, a helical spring interposed between and secured to the said portions and means whereby the bending ability of the spring may be adjusted.

2. A trolley pole including an upper and a lower section spaced apart, a helical spring interposed between and secured to the said portions, a taut chain secured to each pole section and passing through the spring,'the -polev sections being hollow, and means whereby the tension on the chain may be altered to alter the bending ability of the spring.'

3. trolley pole including upper and lower sections spaced apart, a helical spring interposed between and secured to the sections, a chain passing through the spring and secured to one section, a transverse pin Y l connected to the other end of the chain and passing through a slot in the adjacent section beyond the spring7 a collar connected to the pin and slidable on the section, and means for moving the collar lengthwise of said section.

4; A trolley pole including an upper and a lower section spaced apart, a helical spring interposed between and secured tosaid sections, and means for altering the distance between the adjacent-'ends of the spaced pole sections, whereby the tension of the spring may be altered.

In testimony whereof I affix my signature in presence of two witnesses.

Witnesses: Y L. H. MANN,4

GEORGE KARABABOS;

CHARLES HQ GUNN. y l 

